Uzma Saeed and Naveed Muzhar (2017) “Correlating Serum Beta hCG Levels with Transvaginal Sonographic Features of Ectopic Pregnancy”, Journal of Rawalpindi Medical College. Rawalpindi, Pakistan, 21(1). Available at: https://www.journalrmc.com/index.php/JRMC/article/view/111 (Accessed: 20 November 2025).